(1) Grading, erosion and sediment control (ESC). A permit shall be required for all proposed land-disturbing activity unless otherwise exempted in this chapter that meets any or all of the following:
(a) Includes excavation, filing, or stockpiling of erodible material in excess of 50 cubic yards per acre;
(b) Disturbs more than one acre of land or 10,000 square feet if any part of the disturbed area is within 300 feet of a lake, stream or wetland and drains towards it; and/or
(c) A land-disturbing activity, regardless of size, that the city determines is likely to cause an adverse impact to an environmentally sensitive area or other property.
(2) Grading, erosion and sediment control plan design standards. Grading, erosion and sediment control plans must comply with the following criteria:
(a) All site erosion and sediment control practices shall be consistent with Minnesota Pollution Control Agency document “Protecting water Quality in Urban Areas (1994)” as amended and City of Lino Lakes General Specifications and Standard Detail Plates for Street and Utility Construction, as amended.
(b) Natural site topography and soil conditions must be specifically addressed to reduce erosion and sedimentation during construction and after project completion.
(c) The project must be phased as best as possible to minimize disturbed areas and removal of existing vegetation until necessary for project progress.
(d) The city may require additional erosion and sediment control measures on areas with a continuous slope leading to a sensitive, impaired or special water body, stream, ditch or wetland to assure retention of sediment on site.
(e) The plan must include conditions adequate to protect facilities to be used for post-construction stormwater infiltration.
(f) Protection shall be provided to minimize disturbance to surrounding soils, root systems and trunks of trees adjacent to site activity that are intended to be left standing.
(g) Compaction of site soils shall be minimized.
(h) All imported materials shall be approved by the City Engineer prior to placement on the site.
(i) Appropriate on-site containment must be provided for all trash, solid waste, construction debris, floating debris, and hazardous materials. Disposal of collected sediment shall be deposited only in approved locations.
(3) Grading, erosion and sediment control (ESC) required exhibits. The plan shall be prepared and signed by a duly licensed professional engineer in the State of Minnesota. The following exhibits must accompany the permit application: two plan sets, full size (22 inches by 34 inches); and one electronic copy in a .pdf format. All plan sets shall also be submitted electronically in a .dwg format or as otherwise determined by the City Engineer. The minimum requirements of the grading, erosion, and sediment control plan shall be consistent with the most recent version of the NPDES permit requirements and include the following information:
(a) Project name and location;
(b) Address, county parcel identification number and legal description of the property;
(c) Names and addresses of the record owner, developer, land surveyor, engineer, designer of the plat, and any agents, contractors, and subcontractors who will be responsible for project implementation, including the name, address and phone number of the party responsible for maintenance of all erosion and sediment control measures;
(d) Tabulation of construction implementation schedule, including: estimated start date, time frames, and schedules for each construction phase, and completion date;
(e) Copies of permits or permit applications required by any other government entity or agencies including mitigation measures required as a result of any review for the project (e.g., wetland mitigation, EAW, EIS, archaeology survey);
(f) Existing conditions map. An existing topographic site map, drawn to a legible scale and clearly labeled with a north arrow and date of preparation. The plan, based on a certificate of survey, shall include the following information:
1. Property lines and lot dimensions;
2. Existing zoning classifications for land within and abutting the development, including shoreland, floodway, floodway fringe, or general floodplain, and other natural resource overlay districts;
3. All buildings and outdoor uses including all dimensions and setbacks;
4. All public and private roads, interior roads, driveways and parking lots;
5. Show ordinary high water levels of all navigable waters, 100-year critical flood duration event elevations, and delineated wetland boundaries, if any. If not available, appropriate flood zone determination or wetland delineation, or both, may be required at the applicant's expense;
6. Identify all special waters and impaired waters, as identified in the most recent listing by the MPCA, within one mile of the project that receive runoff from the project;
7. Location of drainage areas, existing storm sewer facilities, including pipes, manholes, catch basins, ponds, swales and drainage channels within 100 feet of the subject property. Existing pipe sizes, grades, rim and invert elevations, and normal and high water elevations must be included;
8. Existing contours at one foot intervals, shown as dashed lines for the subject property and extending 100 feet beyond the outside boundary of the proposed plat;
9. Location of any steep slopes where areas have an average slope of more than 12% over a distance of at least 50 feet, or bluff areas as defined in the Shoreland ordinance, whichever is applicable; and
10. Location of wooded areas, high quality native plant communities, or other officially designated natural resource areas.
(g) Proposed conditions map.
1. Maps identifying areas discussed in (3)(f)1. through (f)10. of this section.
2. Location, size, and approximate grade of proposed public sewer and water mains.
3. Elevations, sections, profiles, and details as needed to describe all natural and artificial features of the project.
4. Proposed grade contours at one-foot intervals shown as solid lines.
5. An estimate of the total volume (cubic yards) of materials proposed to be imported to or exported from the site.
6. Provisions for groundwater management (dewatering), including subsurface drains, disposals, ponding and flood controls.
7. Spot elevations at drainage break points and directional arrows indicating site swale and lot drainage.
8. Proposed lot lines, lot and block numbers, building style, building pad location and elevations at the lowest floor and garage slab, if applicable, for each lot.
9. Locations, sizes, grades, rim and invert elevations of all proposed stormwater facilities, including ponds, proposed to serve the subject property.
10. The location of all oversize, non-typical easements including conservation easements, if applicable.
11. Show the boundary of the 100-year flood elevations of all waterbodies.
12. Locations of all stormwater management practices, infiltration areas, and areas not to be disturbed during construction.
13. Normal water level, high water level, and emergency overflow elevations for the site and all associated ponding systems.
14. Location of areas where construction will be phased to minimize duration of exposed soil areas. Include map and calculations as necessary of areas of grubbing, clearing, tree removal, grading, excavation, fill, and other disturbance; areas of soil or earth material storage; quantities of soil or earth material to be removed, placed, stored, or otherwise moved on site, and delineated limits of disturbance.
15. Location and type of all temporary and permanent erosion prevention, sediment control, stormwater runoff, and soil stabilization BMP’s, along with procedures to be used to establish additional temporary BMP’s as necessary for the site conditions during construction. Standard plates and/or specifications for the BMP’s used on the project must be included in the final plans and specifications for the project. Location and design of temporary sediment basins where ten acres or more (five acres or more for special or impaired waters) are disturbed and drained to a single point. When site restrictions do not allow for a temporary sediment basin or less than the required acreage is being developed, temporary sediment basins where appropriate are encouraged, but not required in areas with steep slopes or highly erodible soils or to take equivalent measures such as smaller basins, check dams, and vegetated buffer strips.
16. Methods to be used for final stabilization of all exposed soil areas.
17. Documentation that the project applicant has applied for the NPDES permit from the Minnesota Pollution Control Agency (MPCA), when applicable.
18. A stormwater pollution prevention plan for projects that require an NPDES permit.
(4) Construction activity requirements. Any activity subject to a permit under this chapter must conform to the standards of the NPDES general permit regarding construction-site erosion and sediment control.
(5) Inspections. (See also § 1101.011.)
(a) The applicant shall be responsible for inspection, maintenance and effectiveness of all erosion and sediment control measures until final soil stabilization is achieved.
(b) The city may inspect the project site and require the applicant to provide additional erosion control measures as it determined conditions warrant.
(6) Final stabilization.
(a) Erosion and sediment control measures must be maintained until final vegetation and ground cover is established to a density of 70% over the entire pervious surface area.
(b) All temporary erosion and sediment control BMP’s will be removed, by owner, after all disturbed areas have been permanently stabilized.
(Ord. 09-15, passed 10-26-2015; Am. Ord. 10-22, passed 1-9-2023)